Furnace structure



FURNACE STRUCTURE ATTORNEY June 21, 1949. c. LYNN FURNACE STRUCTURE 2 Sheets-Sheet 2 Filed Feb. 22, '1945 INVENTOR C/arence yn/7.

WITNESSES:

ATTORNEY Patented June 21, 1949 `UNI TED FTSE For 'large "fu member 24, and all except the uppermost portion of the curved annular-like hood section 3. The jacket comprises a at annular top plate 38 and an outer narrow upstanding curved bar 4D. The bar 40 and plate 38 have abutting edges welded together to form an annular member which is angular in cross section. This angular member has its edges welded, respectively, to the annular-like section 30 and to the nat annular member 24.

In order to provide a clear path for circulating water around the water jacket 36, the latter also comprises a small extension 42 which extends outwardly from the water jacket and is formed of a flat top plate 44 and spaced outer bars 46 Water-tightly secured to each other and to theannular member 24 and associated parts of the water jacket. A central inne-r bar 48, which eX- tends to the annular-like section 30, divides the extension 42 into a water inlet compartment 50 and a water outlet compartment 52. Water is fed to the inlet compartment 5l) through a pipe 54, and is removed from the outlet compartment 52 through a 4pipe 56. The pipes pass fluidtightly through suitable holes in the skirt section 122and through thestationa-ry base 2. Suitable hoses and connections continuously feed and remove water to and from the pipes 54 and 56.

The heating bell 4 comprises a metal outer casing 66 and a lower frame plate 62 which supl-ports refractory tile 64. The refractory tile carries electrical heating unit-s 66 in any suitable manner.- The frame plate 62 sits yon a narrow annular ring 68, which sits on the outer edge- `portion of the flat annular member 24 of the skirt K section 22.

An indication of the size of an actual installation along the lines of the embodiment shown can be obtained from the following dimensions: outside diameter of the charge-enclosing section I6, 52 inches; height, about 165 inches; inner and outer diameters -of the fiat annular member 24, substantially 54% and 85 inches, respectively;

4 outer diameter of water jacket 36, about 61 inches, the jacket extension 42 extending approximately 8 linches radially outwardly therefrom, and being about 6' inches wide and 1% inches high.

A hood of a type herein described has been found more satisfactory with respect to the occurrence of warpage and cracks and failure of welds than prior similar hoods.y

While I have described my invention with respect to a preferred form thereof associated with a bell furnace, it is obvious vthat the teachings of my invention have broader application.

I claim as my invention:

l. A fabricated circular gas-tight hood of a type described, comprising a cylindrical upstand- Iing charge-enclosing section, an annular substantially horizontal skirt section around and spaced from a bottom portion of said chargeenclosing section, an annular-like curved connection sectionhaving an upstanding part lap- 4ping said bottom portion .of said charge-enclosing section and lhaving an outwardly directed .part lapping said skirt section, members ycooperating with the inner portion vof said skirtr section skirt Section, and water inlet and outlet means ffor said water jacket, passing .through the bottom of said skirt section.

Lil)

2. A fabricated circular gas-tight hood of a type described, comprising a cylindrical upstanding charge-enclosing section, an annular substantially horizontal skirt section around and spaced from a bottom portion of said chargeenclosing section, an annular-like curved connection section having an upstanding part lapping said bottom portion of said charge-enclosing section and having an :outwardly directed part lapping said skirt section, members cooperating with the inner portion of said skirt section and with said outwardly directed part of said connection section, forl forming a low water jacket therewith, said water jacket extending across a minor part only of the width of said skirt section, the top of said water jacket being below the top of said connection section, and water inlet and outlet means for said water jacket, passing through the bottom of said skirt section.

3. A fabricated gas-tight hood of a type described, comprising an upstanding charge-enclosing section, a substantially horizontal skirt section having an inner edge around and spaced from-but near, a bottom portion of said chargeenclosing section, a connection section coextensive with and overlapping said skirt section and said bottom portion of said charge-enclosing section, and wall members cooperating with said connection section for forming a relatively low water jacket extending across a minor part only of the width of said skirt section.

4. A fabricated gas-tight hood of a type de.- scribed, comprising an upstanding charge-enclosing section, a substantially horizontal skirt section having an inner -edge around, and spaced from, a bottom portion of said charge-enclosing section, a connection section co-eXtensive with and overlapping said skirt section and said bottom portion of said charge-enclosing section, wall members cooperating with said connection section for forming a relatively low water jacket extending across a minor part only of the width of said skirt section, and water inlet and outlet piping for said water jacket, passing through said Y, skirt at a distance inwardly spaced .from the outer vedge of said skirt section. l 5. In a bell furnace, the combination of a outer heating bell having walls carrying heating elements, and an inner gas-tight metal hood of a type described spaced from said walls to provide a heating space between the bell and the hood, said heating elements being exposed in said heating space, said hood having an upright charge-enclosing section and a horizontal annular skirt section joined together, said hood being further characterized by having a wall-means providing a water-.jacket at the joint of said upright charge-enclosing jacket and said annular section, said water-jacket having a top wall eX- posed in said heating space and bounding a bottom part of it, said water-jacket occupying an `inner annular part of said skirt, the outer annular part of said skirt being under said walls of said bell, and water inlet and outlet means to `said water-jacket.

6. In a bell furnace, the combination of an .outer heating Abell having walls carrying heating elements, and an inner gas-tight metal hood of a type described spacedfrom said walls to provide a heating space'between the bell and the hood, said heating elements being exposed in said heating space, said hood having an upright vcharge-enclosing section and a horizontal annular skirtV section, 'an annular section which is curved in an axial plane so as 4to provide annular legs, said legs overlapping a bottom part of said upright charge-enclosing section and an inner part of said annular skirt, a low upright cylindrical wall secured to said skirt outwardly of said legs, a top wall secured to said upright wall and to said charge-enclosing section, whereby to form a water-cooling chamber for the joint between said skirt and said charge-enclosing section, said skirt extending radially outwardly beyond said upright Wall to provide an annular part under said walls of said bell for supporting said bell, said top wall of said water-cooling chamber being exposed in said heating space.

CLARENCE LYNN.

6 REFERENCES CITED The following referenioes are of record in the le of this patent:

UNITED STATES PATENTS Number Name Date 2,074,662 McLag Mar. 3, 193'? 2,233,580 Breedon Mar. 4, 1941 2,245,647 Burby June 17, 1941 10 2,249,411 Woodson July 15,1941 

